1. Set env $WATCH_NAMESPACE (default value is "istio-system") and $LEADER_ELECTION_NAMESPACE (default value is "istio-operator")

1. Create the `WATCH_NAMESPACE` and `LEADER_ELECTION_NAMESPACE` if they are not created yet.

```bash
kubectl create ns $WATCH_NAMESPACE --dry-run -o yaml | kubectl apply -f -
kubectl create ns $LEADER_ELECTION_NAMESPACE --dry-run -o yaml | kubectl apply -f -
```

  // on whether the namespace for that object matches the selector. If the
  // object itself is a namespace, the matching is performed on
  // object.metadata.labels. If the object is another cluster scoped resource,
  // it never skips the webhook.
  //
  // For example, to run the webhook on any objects whose namespace is not
  // associated with "runlevel" of "0" or "1";  you will set the selector as
  // follows:
  // "namespaceSelector": {

        "istio.io/gateway-name" .Name
      ) | nindent 4 }}
  ownerReferences:
  - apiVersion: gateway.networking.k8s.io/v1beta1
    kind: Gateway
    name: {{.Name}}
    uid: "{{.UID}}"
spec:
  selector:
    matchLabels:
      "{{.GatewayNameLabel}}": {{.Name}}
  template:
    metadata:
      annotations:
        {{- toJsonMap

    operator.istio.io/component: "IngressGateways"
spec:
{{- if not $gateway.autoscaleEnabled }}
{{- if $gateway.replicaCount }}
  replicas: {{ $gateway.replicaCount }}
{{- end }}
{{- end }}
  selector:
    matchLabels:
{{ $gateway.labels | toYaml | indent 6 }}
  strategy:
    rollingUpdate:
      maxSurge: {{ $gateway.rollingMaxSurge }}
      maxUnavailable: {{ $gateway.rollingMaxUnavailable }}
  template:

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      use, offer to sell, sell, import, and otherwise transfer the Work,
      where such license applies only to those patent claims licensable

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      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      (except as stated in this section) patent license to make, have made,
      use, offer to sell, sell, import, and otherwise transfer the Work,
      where such license applies only to those patent claims licensable

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      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      (except as stated in this section) patent license to make, have made,
      use, offer to sell, sell, import, and otherwise transfer the Work,
      where such license applies only to those patent claims licensable